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The performance and growth of four hundred forty newly weaned nursery pigs were observed over a 35-day trial at the Iowa State University Swine Nutrition Farm. Pigs were allotted to one of four treatments: an NRC derived positive control [PC], a negative control with 10% lower SID lysine with relative lowering of all other essential amino acids and 1% reduced fat [NC], and two phytase levels: 0 vs 2,500 FTU Quantum Blue, with the 2,500 FTU being considered 'super-dosed'. Pigs started with an average initial body weight of 6.27 ± 0.01 kg., and received feed and water ad libitum. For the overall experiment, both diet and phytase improved ADG and G:F. However, ADFI was unaffected, and there were no interactions. In conclusion, including phytase at super-dosed levels in the nursery pig diet improves growth performance, regardless of diet adequacy. Introduction Phytate is a compound that plants use to store phosphorous. The phosphorous that is bound by phytate is not accessible to the pig, as pigs do not synthesize phytase, which is the enzyme that breaks down phytate. Producers add exogenous phytate to pig diets to help utilize this bound phosphorus. This allows producers to reduce the level of inorganic phosphorus that must be added to pig diets, thereby reduce feed costs. In addition, pigs will excrete less phosphorus in the manure, so the use of phytase also has environmental benefits as well. In addition to including phytase to access the phytate-bound phosphorous in plant ingredients, previous studies have shown that phytase fed at super-dosing levels, or levels much higher than what is needed to release the bound phosphorus, may improve pig performance. The expectation is that high levels of phytase release other nutrients in the diet, thus enhancing pig performance. However, the results have been inconsistent. The objective of this experiment was to further evaluate the concept of using phytase at super-dosed levels. Super-dosed level of phytase were added to diets that were fully adequate in terms of nutrient content, versus a diet that was deficient in amino acids as well as lower in energy. Our

Super-dosed Phytase Improves Rate and Efficiency of Gain in Nursery Pigs